INFINITY

Defined in header `<math.h>`		(deprecated in C++26)
Defined in header `<float.h>`		(since C++26)
#define INFINITY /* implementation-defined */		(since C++11)

If the implementation supports an infinity for the type float, the macro INFINITY expands to constant expression of type float which evaluates to positive or unsigned infinity.

Otherwise, the macro `INFINITY` expands to a positive value that is guaranteed to overflow a float at compile time, and the use of this macro generates a compiler warning.	(until C++26)
Otherwise, the macro `INFINITY` is not defined.	(since C++26)

isinf (C++11)	checks if the given number is infinite (function)
HUGE_VALFHUGE_VALHUGE_VALL (C++11)(C++11)	indicates the overflow value for float, double and longdouble respectively (macro constant)
has_infinity [static]	identifies floating-point types that can represent the special value "positive infinity" (public static member constant of `std::numeric_limits<T>`)
infinity [static]	returns the positive infinity value of the given floating-point type (public static member function of `std::numeric_limits<T>`)
C documentation for `INFINITY`

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INFINITY

See also